216661051602 has 24 divisors (see below), whose sum is σ = 471034447884. Its totient is φ = 71973862944.

The previous prime is 216661051591. The next prime is 216661051609. The reversal of 216661051602 is 206150166612.

It can be written as a sum of positive squares in 2 ways, for example, as 215547561441 + 1113490161 = 464271^2 + 33369^2 .

It is a super-2 number, since 2×216661051602² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216661051609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20535213 + ... + 20545760.

Almost surely, 2^216661051602 is an apocalyptic number.

216661051602 is an abundant number, since it is smaller than the sum of its proper divisors (254373396282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216661051602 is a wasteful number, since it uses less digits than its factorization.

216661051602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41081274 (or 41081271 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 216661051602 in words is "two hundred sixteen billion, six hundred sixty-one million, fifty-one thousand, six hundred two".